Measurement and Instrumentation
The two pressure coils of a single phase power factor meter have

The same dimension but different number of turns
None of these
The same dimensions and the same number of turns
The same number of turns but different dimensions

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Measurement and Instrumentation
Consider the following statement - 1. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the current coil. 2. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the voltage coil circuit.

 Both 1 and 2 are false.
  1 is false but 2 is true.
 Both 1 and 2 are true.
 1 is true but 2 is false.

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Measurement and Instrumentation
A DC potentiometer is the best means available for the measurement of DC voltage because

 It is possible to standardize before a measurement is undertaken.
  It is based on null balance technique.
 None of above.
 The precision in measurment is independent of the type of the defector used.

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